What is the formula to calculate the future value of a growing annuity with perpetuity?

What is the formula to calculate the future value of a growing annuity with perpetuity?

The formula to calculate the future value of a growing annuity with perpetuity is:

FV = C * (1 + g) / (r - g)

Where:
FV = Future value
C = Cash flow per period
g = Growth rate of cash flows
r = Discount rate